Zur deutschen Seite
- Fabrication Responsibility:
- Andras Gschwindt, HA5WH
Peter Bakki, HG5CQC
Sandor Blasko, HG5CRS
- Average Power Dissipation:
- 1 Watt
The ionosphere MONITOR experiment is designed for passive
sounding the space above the ionosphere in the HF band between
0.5 and 30 MHz. The analog part of the MONITOR measures the
electromagnetic field density in the mentioned band.
The receiver consists of two mixers. The first IF is 45 MHz, the
second is 455 kHz, both with a bandwidth of 7.5 kHz. A linear IF
amplifier stage measures the received signal strength in 80 dB
dynamic range. AM demodulation of the signal is also possible.
The system is controlled by a built-in computer which command
the receiver and store the measured data. The CPU is a Motorola
68HC11 microcontroller. The system can sweep in the whole
frequency range with step sizes of 5 kHz and 9 kHz or repeat the
measurements on one selected frequency.
Last updated: Jan 5, 1996
by Ralf Zimmermann, DL1FDT